Shadow of the Sith is a canon adult novel set 19 years after the events of Return of the Jedi. It follows the story of Luke Skywalker and Lando Calrissian as they search for the lost heir to the Sith, Darth Sidious.

The novel begins with Luke and Lando on a mission to the planet Exegol, where they believe Sidious is hiding. They soon discover that Sidious is not alone, and that he has been building a new army of Sith loyalists. Luke and Lando must race against time to stop Sidious before he can unleash his new army on the galaxy.

The novel is a fast-paced adventure story with plenty of action, suspense, and mystery. It also explores some interesting themes about the nature of good and evil, and the importance of hope.